JP2000072027A - Side clutch type steering/braking device for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit power to the right and left axles even when a clutch body on the turn inside is cut off and to improve maneuverability by providing a transmission torque limiter weaker than at least the maximum braking force between the right and left axles in a work vehicle provided with a side clutch type steering/braking device. SOLUTION: Transmission power is applied to a transmission shaft 12 in a transmission 10 from a prime mover via a gear 14 or 16, and the transmission power is transmitted to a final transmission shaft 18 via the meshing of gears 20, 22. The final transmission shaft 18 is provided with a pair of right and left slide type clutch bodies 24, and the rotation of the final transmission shaft 18 is transmitted to the right and left axles 32 via gears 34, 34 invariably meshed with the gear sections 26 of the clutch bodies 24. A multi-disk torque limiter 38 is provided between the right and left axles 32, 32. When an operation lever is operated to disengage one clutch body 34 from the gear 22, transmission power can be applied to the axle 32 on the side that the clutch body 24 is disengaged from the other axle 32, and the straight travel of a machine body is guaranteed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side clutch type steering / braking device for a work vehicle.

[0002]

2. Description of the Related Art Many work vehicles that run at relatively low speed and perform heavy work use a so-called side clutch type steering / braking device. That is, a clutch body that enables intermittent power transmission from a transmission shaft to each axle between a transmission shaft provided on a transmission and left and right axles, and applies a braking force to the axle according to an operation force when disconnected. And the vehicle is driven straight, turned, and stopped by operating the clutch body.

[0003]

In this case, when the power to one axle is cut off, the wheel on that side stops almost immediately, so that the vehicle turns with an extremely small turning radius. Therefore, when the vehicle is running under certain conditions, even if the power to one axle is disconnected by operating the clutch body, the vehicle may go straight without turning. For example, a snowplow running on a snowy road or a work vehicle running on a thick ground is the case, and even if the power of one axle is cut off, the road resistance is small and the vehicle may slip and not turn. Such a situation is very dangerous because the pilot performs this operation with the turning in mind. The present invention
The purpose is to solve such a problem.

[0004]

SUMMARY OF THE INVENTION According to the present invention, power transmission from a transmission shaft to each axle can be intermittently provided between a transmission shaft provided on a transmission and left and right axles.
In a side clutch type steering / braking device for a work vehicle provided with a clutch body that applies a braking force according to an operation force to an axle, a torque having a transmission torque at least weaker than a maximum braking force between both axles. A side clutch type steering / braking device for a work vehicle, wherein a limiter is interposed.

[0005] By taking this measure, when the clutch body inside the turning is disengaged in order to turn to either side, power is transmitted from the other axle to the disengaging axle by the torque limiter. Therefore, the aircraft keeps going straight and does not cause a slip or the like. Also, the shock at the time of disconnecting the clutch body is reduced. When the clutch body is continuously operated to apply a braking force to the axle, the torque limiter starts slipping and turns when the torque exceeds the transmission torque of the torque limiter. The turning radius at this time depends on the operating force. In this case, even if the clutch body is disengaged, the body does not always turn, but there is no particular problem if the operator is accustomed to this.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial sectional view of a mission of a work vehicle showing an example of the present invention.
The (middle) transmission shaft 12 provided in the
Power transmission by two kinds of rotation speeds is provided from a prime mover (not shown) by 4 and 16. A (final) transmission shaft 18 is provided next to the transmission shaft 12, and the two transmission shafts 1
Gears 20 and 22 fitted and engaged with the centers of the gears 2 and 18 respectively transmit the power transmitted by the rotation speed of the transmission shaft 12 to the transmission shaft 18.

On the transmission shaft 18, a pair of left and right sliding clutch bodies 24 are provided outside the gear 22. The clutch bodies 24 have a gear portion 26, and when the clutch body 24 is slid toward the center, When the gear portion 26 is engaged with the gear 22 and slid outward, the multi-plate type brake 3 interposed between the gear portion 26 and the side wall 28 of the transmission 10.
By pressing 0, a braking force is applied.
The braking force increases in proportion to the pressing force.

Further, next to the transmission shaft 18, the left and right axles 3
2 are provided in abutting condition, and each axle 32
A gear 34 is firmly fitted to one end of the gear. This gear 34
The gear portion 26 of the clutch body 24 and the clutch body 24 are always engaged so that they do not come off even if they slide in either direction. An operation fork 36 is engaged with the clutch body 24, and the operation fork 36 is connected to a steering lever (not shown) via an appropriate operation cable.

In the present invention, a torque limiter 38 is interposed between two axles 32. The torque limiter 38 of the present example includes a drum 40 attached to a central side surface of one of the gears 34 and a hub 42 fixedly fitted to a central end surface of the other axle 32, and a plurality of transmissions engaged with each other. Board 4
4 shows a multi-plate type in which 4 and 46 are brought into sliding contact with each other. Then, the two types of transmission plates 44 and 46 are pressed by a disc spring 48, and the transmission force is derived by the pressing force.
This transmission torque is set to be weaker than the maximum braking force by the brake 30.

As described above, if the clutch body 24 and the gear 22 are engaged, the aircraft body travels straight. However, if the clutch body 24 is disengaged from the gear 22 by operating the steering lever, the axle 32 on the corresponding side is attached. The transmitted power will be cut off. However, the torque limiter 38 receives power transmission from the other axle 32, and the aircraft still continues to travel straight.

However, if the steering lever is continuously operated toward the brake side, the braking force of the brake 3 increases, and eventually exceeds the transmission torque of the torque limiter 38. In this state, the power to the axle 32 on this side is cut off, and the vehicle starts turning. The turning radius at this time is inversely proportional to the braking force, but this point is the same as that of the conventional side clutch type steering / braking device.

As described above, since the power to the axle 32 on the corresponding side is not cut off simply by disconnecting the clutch body 24, it is possible to prevent a situation in which a slip occurs due to a low resistance on a snowy road or the like. Increases safety. At the same time, when the clutch body 24 is disconnected to shut off the power, there is a large impact, but this impact can also be reduced.

FIG. 2 is a partial sectional view of a transmission of a work vehicle showing another example of the present invention. In this example, two gears 3 in which a drum 40 and a hub 42 are fitted to an axle 32 are shown.
4, a disc spring 48 for pressing the two types of transmission plates 44 and 46 is fitted to a shaft 50 passing between the hubs 42. In this embodiment, the axle 32 is shortened to secure a space for fitting the shaft 50, and the driving body 52 is fixedly fitted to the axle 32 and is linked to the gear.

[0014]

As described above, according to the present invention, even if the clutch body inside the turning is disengaged to turn to either direction,
Since the power is still transmitted to the side by the torque limiter, the aircraft keeps going straight and does not cause a slip or the like, and is safe. In addition, the shock at the time of disconnecting the clutch body is reduced, and the riding comfort is improved in the case of the riding type, and the maneuverability is improved in the case of the walking type. In this configuration, a so-called gentle turning operation is performed. However, the gentle turning structure can be obtained with a simple configuration in which a torque limiter is provided.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a transmission of a work vehicle showing an example of the present invention.

FIG. 2 is a partial sectional view of a transmission of a work vehicle showing another example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mission 18 Transmission shaft 24 Clutch body 30 Multi-plate type brake 32 Axle 34 Gear 38 Torque limiter 44 Transmission plate 46 Transmission plate 48 Disc spring

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[Procedure amendment]

[Submission date] September 2, 1998 (1998.9.2)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 2

FIG.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Ichiro Tani 428 Enami, Okayama City, Okayama Prefecture F-term (reference) 3D039 AA02 AA03 AB21 AC03 AC21 AD11 3D052 AA01 AA11 BB08 DD01 DD03 FF01 HH01 JJ11 JJ12 JJ17 JJ20

Claims (4)

[Claims] 1. A power transmission from a transmission shaft to each axle can be intermittently provided between a transmission shaft provided on a transmission and left and right axles, and a braking force according to an operation force is applied to the axle at the time of disconnection. In a side clutch type steering / braking device for a working vehicle having a clutch body interposed therein, a torque limiter having at least a transmission torque smaller than a maximum braking force is interposed between both axles. Side clutch type steering / braking device for vehicles. 2. The clutch body slides on a transmission shaft. When the clutch body is moved to one side, the power of the transmission shaft and the axle is connected. When the clutch body is moved to the other side, the power is cut off. 2. A side clutch type steering / braking device for a work vehicle according to claim 1, wherein the side clutch type steering / braking device works by transmitting a braking force proportional to the pressing force to the axle. 3. The side clutch of a working vehicle according to claim 1, wherein the torque limiter is a disc spring type in which two types of multi-plate transmission plates respectively linked to both axles are pressed by a disc spring. Steering and braking system. 4. The side clutch type steering / braking device for a work vehicle according to claim 3, wherein the disc spring type torque limiter is provided between gears fitted on the axle and linked to the side clutch body. .